PayDay: The Heist is the new addition to the Instant Game Collection for tomorrow, which nobody guessed. Nobody takes one of my codes this week, so you can try again next time. I'm going to take a guess and say that the next addition will be on 10/30, which may be where your Halloween guesses would be better used.
Just as a tip to you guys, Minis, PS1 Games, and Betas are not a part of the Instant Game Collection, which only includes PSN games and PS3 games. Those are offered as extras beyond what the IGC includes, so some of you will be better off guessing the right types of games next time.